21320450

素因数分解:

$2^1\times 5^2\times {\mathrm{653}}^2$

素因数の和:1318

約数の個数: 18

約数和(自身を含む): 39716859

約数和(自身を除く): 18396409

約数列:

[1, 2, 5, 10, 25, 50, 653, 1306, 3265, 6530, 16325, 32650, 426409, 852818, 2132045, 4264090, 10660225, 21320450]

約数ペア:

[(1, 21320450), (2, 10660225), (5, 4264090), (10, 2132045), (25, 852818), (50, 426409), (653, 32650), (1306, 16325), (3265, 6530)]